Comment #16 on issue 1263 by mattpap: Invalid movement of roots across
fractions
http://code.google.com/p/sympy/issues/detail?id=1263
Also, it looks like the problem is in cancel:
In [1]: z = Symbol('z', real=True, negative=True)
In [2]: sqrt(1/z)
Out[2]:
___
/ 1
/ -
\/ z
In [3]: _.as_numer_denom()
Out[3]:
____
(I, \/ -z )
In [4]: expand(_[1])
Out[4]:
___
I*\/ z
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